Officers injured, slain in what appear to be targeted shootings

Police are on high alert -- and in at least one city, mourning -- after four officers were shot Sunday in incidents around the country. Perhaps most startling to law enforcement is that in three of the shootings, it appears the alleged perpetrators specifically targeted police officers, according to authorities and local media reports.
Read more: http://www.cnn.com/2016/11/21/us/police-shootings-san-antonio-st-louis-sanibel-gladstone/index.html?source=Snapzu